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353 lines
14 KiB
Objective-C
353 lines
14 KiB
Objective-C
/* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASRangeController.h>
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#import <AsyncDisplayKit/ASTableViewProtocols.h>
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#import <AsyncDisplayKit/ASBaseDefines.h>
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#import <AsyncDisplayKit/ASBatchContext.h>
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@class ASCellNode;
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@protocol ASTableViewDataSource;
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@protocol ASTableViewDelegate;
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/**
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* Node-based table view.
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*
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* ASTableView is a version of UITableView that uses nodes -- specifically, ASCellNode subclasses -- with asynchronous
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* pre-rendering instead of synchronously loading UITableViewCells.
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*/
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@interface ASTableView : UITableView
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@property (nonatomic, weak) id<ASTableViewDataSource> asyncDataSource;
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@property (nonatomic, weak) id<ASTableViewDelegate> asyncDelegate; // must not be nil
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/**
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* Tuning parameters for a range.
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*
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* @param rangeType The range to get the tuning parameters for.
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*
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* @returns A tuning parameter value for the given range.
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*
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* Defaults to the render range having one sceenful both leading and trailing and the preload range having two
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* screenfuls in both directions.
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*/
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- (ASRangeTuningParameters)tuningParametersForRangeType:(ASLayoutRangeType)rangeType;
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/**
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* Set the tuning parameters for a range.
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*
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* @param tuningParameters The tuning parameters to store for a range.
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* @param rangeType The range to set the tuning parameters for.
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*/
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- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeType:(ASLayoutRangeType)rangeType;
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/**
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* Initializer.
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*
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* @param frame A rectangle specifying the initial location and size of the table view in its superview’s coordinates.
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* The frame of the table view changes as table cells are added and deleted.
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*
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* @param style A constant that specifies the style of the table view. See UITableViewStyle for descriptions of valid constants.
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*
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* @param asyncDataFetchingEnabled Enable the data fetching in async mode.
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*
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* @discussion If asyncDataFetching is enabled, the `ASTableView` will fetch data through `tableView:numberOfRowsInSection:` and
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* `tableView:nodeForRowAtIndexPath:` in async mode from background thread. Otherwise, the methods will be invoked synchronically
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* from calling thread.
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* Enabling asyncDataFetching could avoid blocking main thread for `ASCellNode` allocation, which is frequently reported issue for
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* large scale data. On another hand, the application code need take the responsibility to avoid data inconsistence. Specifically,
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* we will lock the data source through `tableViewLockDataSource`, and unlock it by `tableViewUnlockDataSource` after the data fetching.
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* The application should not update the data source while the data source is locked, to keep data consistence.
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*/
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- (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style asyncDataFetching:(BOOL)asyncDataFetchingEnabled;
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/**
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* The number of screens left to scroll before the delegate -tableView:beginBatchFetchingWithContext: is called.
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*
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* Defaults to one screenful.
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*/
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@property (nonatomic, assign) CGFloat leadingScreensForBatching;
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/**
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* Reload everything from scratch, destroying the working range and all cached nodes.
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*
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* @param completion block to run on completion of asynchronous loading or nil. If supplied, the block is run on
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* the main thread.
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* @warning This method is substantially more expensive than UITableView's version.
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*/
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-(void)reloadDataWithCompletion:(void (^)())completion;
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/**
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* Reload everything from scratch, destroying the working range and all cached nodes.
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*
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* @warning This method is substantially more expensive than UITableView's version.
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*/
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- (void)reloadData;
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/**
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* begins a batch of insert, delete reload and move operations. This method must be called from the main thread.
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*/
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- (void)beginUpdates;
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/**
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* Concludes a series of method calls that insert, delete, select, or reload rows and sections of the table view.
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* You call this method to bracket a series of method calls that begins with beginUpdates and that consists of operations
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* to insert, delete, select, and reload rows and sections of the table view. When you call endUpdates, ASTableView begins animating
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* the operations simultaneously. This method is must be called from the main thread. It's important to remeber that the ASTableView will
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* be processing the updates asynchronously after this call is completed.
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*
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* @param animated NO to disable all animations.
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* @param completion A completion handler block to execute when all of the operations are finished. This block takes a single
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* Boolean parameter that contains the value YES if all of the related animations completed successfully or
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* NO if they were interrupted. This parameter may be nil. If supplied, the block is run on the main thread.
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*/
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- (void)endUpdates;
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/**
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* Concludes a series of method calls that insert, delete, select, or reload rows and sections of the table view.
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* You call this method to bracket a series of method calls that begins with beginUpdates and that consists of operations
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* to insert, delete, select, and reload rows and sections of the table view. When you call endUpdates, ASTableView begins animating
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* the operations simultaneously. This method is must be called from the main thread. It's important to remeber that the ASTableView will
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* be processing the updates asynchronously after this call and are not guaranteed to be reflected in the ASTableView until
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* the completion block is executed.
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*
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* @param animated NO to disable all animations.
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* @param completion A completion handler block to execute when all of the operations are finished. This block takes a single
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* Boolean parameter that contains the value YES if all of the related animations completed successfully or
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* NO if they were interrupted. This parameter may be nil. If supplied, the block is run on the main thread.
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*/
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- (void)endUpdatesAnimated:(BOOL)animated completion:(void (^)(BOOL completed))completion;
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/**
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* Inserts one or more sections, with an option to animate the insertion.
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*
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* @param sections An index set that specifies the sections to insert.
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*
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* @param animation A constant that indicates how the insertion is to be animated. See UITableViewRowAnimation.
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*
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* @discussion This method must be called from the main thread. The asyncDataSource must be updated to reflect the changes
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* before this method is called.
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*/
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- (void)insertSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
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/**
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* Deletes one or more sections, with an option to animate the deletion.
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*
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* @param sections An index set that specifies the sections to delete.
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*
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* @param animation A constant that indicates how the deletion is to be animated. See UITableViewRowAnimation.
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*
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* @discussion This method must be called from the main thread. The asyncDataSource must be updated to reflect the changes
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* before this method is called.
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*/
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- (void)deleteSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
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/**
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* Reloads the specified sections using a given animation effect.
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*
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* @param sections An index set that specifies the sections to reload.
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*
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* @param animation A constant that indicates how the reloading is to be animated. See UITableViewRowAnimation.
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*
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* @discussion This method must be called from the main thread. The asyncDataSource must be updated to reflect the changes
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* before this method is called.
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*/
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- (void)reloadSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
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/**
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* Moves a section to a new location.
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*
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* @param section The index of the section to move.
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*
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* @param newSection The index that is the destination of the move for the section.
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*
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* @discussion This method must be called from the main thread. The asyncDataSource must be updated to reflect the changes
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* before this method is called.
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*/
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- (void)moveSection:(NSInteger)section toSection:(NSInteger)newSection;
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/**
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* Inserts rows at the locations identified by an array of index paths, with an option to animate the insertion.
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*
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* @param indexPaths An array of NSIndexPath objects, each representing a row index and section index that together identify a row.
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*
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* @param animation A constant that indicates how the insertion is to be animated. See UITableViewRowAnimation.
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*
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* @discussion This method must be called from the main thread. The asyncDataSource must be updated to reflect the changes
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* before this method is called.
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*/
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- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
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/**
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* Deletes the rows specified by an array of index paths, with an option to animate the deletion.
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*
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* @param indexPaths An array of NSIndexPath objects identifying the rows to delete.
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*
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* @param animation A constant that indicates how the deletion is to be animated. See UITableViewRowAnimation.
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*
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* @discussion This method must be called from the main thread. The asyncDataSource must be updated to reflect the changes
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* before this method is called.
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*/
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- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
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/**
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* Reloads the specified rows using a given animation effect.
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*
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* @param indexPaths An array of NSIndexPath objects identifying the rows to reload.
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*
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* @param animation A constant that indicates how the reloading is to be animated. See UITableViewRowAnimation.
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*
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* @discussion This method must be called from the main thread. The asyncDataSource must be updated to reflect the changes
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* before this method is called.
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*/
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- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
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/**
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* Moves the row at a specified location to a destination location.
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*
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* @param indexPath The index path identifying the row to move.
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*
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* @param newIndexPath The index path that is the destination of the move for the row.
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*
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* @discussion This method must be called from the main thread. The asyncDataSource must be updated to reflect the changes
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* before this method is called.
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*/
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- (void)moveRowAtIndexPath:(NSIndexPath *)indexPath toIndexPath:(NSIndexPath *)newIndexPath;
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/**
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* Similar to -cellForRowAtIndexPath:.
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*
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* @param indexPath The index path of the requested node.
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*
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* @returns a node for display at this indexpath.
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*/
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- (ASCellNode *)nodeForRowAtIndexPath:(NSIndexPath *)indexPath;
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/**
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* Similar to -visibleCells.
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*
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* @returns an array containing the nodes being displayed on screen.
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*/
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- (NSArray *)visibleNodes;
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/**
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* YES to automatically adjust the contentOffset when cells are inserted or deleted "before"
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* visible cells, maintaining the users' visible scroll position. Currently this feature tracks insertions, moves and deletions of
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* cells, but section edits are ignored.
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*
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* default is NO.
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*/
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@property (nonatomic) BOOL automaticallyAdjustsContentOffset;
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@end
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/**
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* This is a node-based UITableViewDataSource.
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*/
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@protocol ASTableViewDataSource <ASCommonTableViewDataSource, NSObject>
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/**
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* Similar to -tableView:cellForRowAtIndexPath:.
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*
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* @param tableView The sender.
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*
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* @param indexPath The index path of the requested node.
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*
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* @returns a node for display at this indexpath. Must be thread-safe (can be called on the main thread or a background
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* queue) and should not implement reuse (it will be called once per row). Unlike UITableView's version, this method
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* is not called when the row is about to display.
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*/
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- (ASCellNode *)tableView:(ASTableView *)tableView nodeForRowAtIndexPath:(NSIndexPath *)indexPath;
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@optional
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/**
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* Provides the constrained size range for measuring the node at the index path.
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*
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* @param tableView The sender.
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*
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* @param indexPath The index path of the node.
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*
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* @returns A constrained size range for layout the node at this index path.
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*/
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- (ASSizeRange)tableView:(ASTableView *)tableView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath;
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/**
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* Indicator to lock the data source for data fetching in async mode.
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* We should not update the data source until the data source has been unlocked. Otherwise, it will incur data inconsistence or exception
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* due to the data access in async mode.
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*
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* @param tableView The sender.
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*/
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- (void)tableViewLockDataSource:(ASTableView *)tableView;
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/**
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* Indicator to unlock the data source for data fetching in asyn mode.
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* We should not update the data source until the data source has been unlocked. Otherwise, it will incur data inconsistence or exception
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* due to the data access in async mode.
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*
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* @param tableView The sender.
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*/
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- (void)tableViewUnlockDataSource:(ASTableView *)tableView;
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@end
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/**
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* This is a node-based UITableViewDelegate.
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*
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* Note that -tableView:heightForRowAtIndexPath: has been removed; instead, your custom ASCellNode subclasses are
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* responsible for deciding their preferred onscreen height in -calculateSizeThatFits:.
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*/
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@protocol ASTableViewDelegate <ASCommonTableViewDelegate, NSObject>
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@optional
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- (void)tableView:(ASTableView *)tableView willDisplayNodeForRowAtIndexPath:(NSIndexPath *)indexPath;
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- (void)tableView:(ASTableView *)tableView didEndDisplayingNodeForRowAtIndexPath:(NSIndexPath*)indexPath;
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/**
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* Receive a message that the tableView is near the end of its data set and more data should be fetched if necessary.
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*
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* @param tableView The sender.
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* @param context A context object that must be notified when the batch fetch is completed.
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*
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* @discussion You must eventually call -completeBatchFetching: with an argument of YES in order to receive future
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* notifications to do batch fetches. This method is called on a background queue.
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*
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* ASTableView currently only supports batch events for tail loads. If you require a head load, consider implementing a
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* UIRefreshControl.
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*/
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- (void)tableView:(ASTableView *)tableView willBeginBatchFetchWithContext:(ASBatchContext *)context;
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/**
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* Tell the tableView if batch fetching should begin.
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*
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* @param tableView The sender.
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*
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* @discussion Use this method to conditionally fetch batches. Example use cases are: limiting the total number of
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* objects that can be fetched or no network connection.
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*
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* If not implemented, the tableView assumes that it should notify its asyncDelegate when batch fetching
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* should occur.
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*/
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- (BOOL)shouldBatchFetchForTableView:(ASTableView *)tableView;
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@end
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@interface ASTableView (Deprecated)
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@property (nonatomic, assign) ASRangeTuningParameters rangeTuningParameters ASDISPLAYNODE_DEPRECATED;
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@end
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